Post-apocalyptic Civil War, in which Southern states including Texas refuse to give up their fossil fuels, and a fragmented Union fights them with drones and soldiers recruited from a working class desperate for opportunity. Meanwhile from across the ocean, the Red Crescent and the Chinese send charity aid and administer refugee camps. It’s told from the post-war future so you know how things end, but not how they got there; the main character, Sarat, travels an all-too-believable arc from child refugee to violent insurgent. Super intense book and quite frightening, particularly when you consider the tribalism that seems to be increasing today.